“…Psychopaths show decreased autonomic reactivity to emotional stimuli, as compared with nonpsychopaths, particularly when the stimuli depict fearful or threatening content (Lykken, 1957;Patrick, 1994) or others in distress (Aniskiewicz, 1979;Blair, Jones, Clark, & Smith, 1997), as well as impaired identification of fearful facial expressions and vocal expressions of fear (Blair, 1999;Blair et al, 2004;Blair, Mitchell, & Richell, 2002). Neuro imaging studies have shown that psychopaths, relative to nonpsychopaths, show increased lateral and superior prefrontal activity (Gordon, Baird, & End, 2004;Kiehl et al, 2001;Müller et al, 2003) and diminished limbic activity (Birbaumer et al, 2005;Gordon et al, 2004;Kiehl et al, 2001; but see Müller et al, 2003) to emotional stimuli, including unpleasant words or facial expressions. These findings indicate that psychopathy does not merely represent the "low end" of the normal spectrum of emotional reactiv-1991), and psychopathic personality, which is associated with attenuated reactivity to negative emotional stimuli (Lykken, 1957;Patrick, 1994).…”